package Demo2;

import java.io.IOException;
import java.net.*;
import java.util.Scanner;

public class UDPEchoClient {
    private DatagramSocket socket = null;
    private String serverIP;
    private int serverPort;
    public UDPEchoClient(String serverIP,int serverPort) throws SocketException {
        socket = new DatagramSocket();
        this.serverIP = serverIP;
        this.serverPort = serverPort;
    }
    public void start() throws IOException {
        System.out.println("客户端启动");
        Scanner scanner = new Scanner(System.in);
        while(true){
            System.out.print("->");
            String request = scanner.next();
            DatagramPacket requestPacket = new DatagramPacket(request.getBytes(),request.getBytes().length, InetAddress.getByName(this.serverIP),this.serverPort);
            socket.send(requestPacket);
            DatagramPacket responsePacket = new DatagramPacket(new byte[4096],4096);
            socket.receive(responsePacket);
            String response = new String(responsePacket.getData(),0,responsePacket.getLength());
            System.out.println(response);
        }
    }

    public static void main(String[] args) throws IOException {
        UDPEchoClient client = new UDPEchoClient("127.0.0.1",9090);
        client.start();

    }
}
